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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2d3eaac809c58432add31936f6b95bf05db2c7972b2784d54d2a99364cd25a4' 
  AND token = '3EGLwksUPdmBcbn9dnJBgmyDmOKjuI3LD3S33werVJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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