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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '385edf71783369d0ff1f984c7a1754b630c0d470ff52c4857b19c4557aa7da0d' 
  AND token = 'nEX0dHI1hGz07ARJ4KRCaEuW1eKqzW0fefRas0jXh30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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