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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b65b8a7318b0fcbae02306997d237b1900b80a010d333d4723611ffe75f8f0e' 
  AND token = 'uoMXsTNJ0Y+yquhYc6/Dczey735BEogy3JOFy+0FV04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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