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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cc471124cb48c9bd00d82843ddb61b5942bd95988cfb8814b28b8d84db69206' 
  AND token = '6FlpWdsMkwrxVM3ocer51NMRSpK6/KBshH6fj8dtums=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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