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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c3d4583b6d526fa6cf6cf981a1f9a2c3a06b7e2043479372848296e4b187c5a' 
  AND token = 'pgOo/BFATbGV/mRo6npk470k7+Q5mpO5uFrsDUO33xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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