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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c3a4ee7608873d4642da5a199bd681d0b76ec0ff668e80bed5aeb06ae0fece0' 
  AND token = 's0oE6wi7/12Q2Mr39jIrAfIegMCI74Rd/fUydC1VF/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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