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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3d1dd635e73f6de471916ca2f538ef36b11c6ff02163dff3e555699bee10495' 
  AND token = 'o66DLSWbloSM9kSvHhVI0bXQhwF1fVeFWLZCPnd2IiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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