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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5d2fe5e46588e1775e0616a5af7a29219c14dcae6fce29dc7d3ecbbf63275c0' 
  AND token = 'dmiwx7ShEA6MERZURm/katD/toXzizVXbzNu4Gt8c78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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