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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e627a830600d4112ba11b2a033f058873502ead2809b2ddbb5519bab5fc9d5e' 
  AND token = 'Muu2l7/khbeDmy88yGcIJGdTAp/vjXzxRuwkF7aHCYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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