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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8708c537acd24a8ab726c371370c0e0ab2b687f0e5cef1ac362e614f90e0f1bb' 
  AND token = 'SXgrMkdJ8vJ+LGADyf3R0y3N/BxO4pc9a4RcdQkMz0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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