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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cd864bec3945a6ca2a223596dd5e0444367a9d1a2fba36823431c291ebebfce' 
  AND token = 'flahbJOto5XkyPpunNzzU7yPhzH3Q/SbPK180Llx3Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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