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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7771444a867d0739541fdcb6e3cb110b3350f69e50642430e5d80f9b21871dc1' 
  AND token = 'dJhailKfepFdThD5jrkJQHxXrntVoL0g5k0T1A4MxNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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