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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '455f1d6e1545ff697f624c21e7f1fdc02f2f854a32ae175c49e66d2fcec12113' 
  AND token = 'hilDxDPc9LLXE9zK911e+icl5u31nPKC7c1bbyybVr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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