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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec75540cdbb3e182a22ef7f52ea18030519e0de352879e720a2bdc06710753de' 
  AND token = 'low5c2u3NsktIDC8wCTD9dsIG/F8w4pCZRJ1FuIMav0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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