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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da7d275be0b194624219a02c0a35c07552e2062cc2c8d4b52fca5b7b0a073071' 
  AND token = '1jPVdLnG6CJjJONoe/yZNizVy5QeHAC2rHtiyHsrvzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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