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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93d11beab11437e1eed1de663658ce729ab10e3d2c6774d335db3397b3ff1953' 
  AND token = '94ZtlfKHB0Znr+R8y7s6D3Sw0dMtniOUktfATomctxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}