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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7558fe530bd6ae291eec13fdee07a31708ee6de85838433fc4e2ca0c11564c58' 
  AND token = 'XEu+Zl+dYLJ8TQ5VN1PfJiONaeHPglijzl/EX2VZ0FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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