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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80291ee14ba4c2975528ad4d57f4762b80a8aeda7ae291de2e3ac7ae216479c6' 
  AND token = '6v1V8iDChAzy25x1ruC852rb/ZUV177R4z2NdWdmSUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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