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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a74db8a0f4a2070304e882139a160e107f7d4b092e6050377f99dec9a84a1435' 
  AND token = '66hq/x6mRjJ2f5l5ISNwMndDwI1l4OR+X1Cqfy2XknE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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