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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2fc578a4be4c334ca478eb6fd7cf738f3f11e90f971aff18305c2a73dd9b6d8' 
  AND token = 'XFY3V6YUbIa0Ak4pufl1zARQaSCehhMIhKRj+bOMxEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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