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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2684000b2eb131c560ff702aac8baa415e4573091983c0805a73090fe47197a' 
  AND token = 'Na2JjVzGt32sJs6ZNJ23xRRLceE8OTB90z8OeUVSKDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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