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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95da05012d94ad6726ba2469ee40f7b73c0b33f31985c15f2aa792214220e676' 
  AND token = '3ZUOMmh9d51/DCSdPXNA4PHcvhmQmI28LP6m89Fmr08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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