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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94782cf61677313faadc183072398cb5a902c034a5cd91a60853579c49262d1d' 
  AND token = 'R+Nz1csNdbz3n9fRatG+AeJ5mQGT0gBIcR/le9SzK10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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