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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd90010993c1eb315057fe0e6074a37ea20290e115641bb782ade4d4e50c5eca5' 
  AND token = 'JuAVbx9NPC5wmIf3O6Nc6w7TWG+Nkfl1hug3aMyD+a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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